In BDSM pain and sensation play, a zipper is a homemade toy that costs almost nothing and has been passed around the scene for years. It is a row of ordinary wooden or plastic clothespins, strung loosely on a strong cord or a light chain. The build is simple. People keep it for the sudden release.
On the skin, then off in one pull
The top sets the clips in a tight line on skin that is fleshy and fairly flat, with some padding and plenty of nerve endings: the inner and outer thighs, the back, the chest and belly, the upper arms. Stay off bony spots, including anywhere a nerve lies against bone. Once the clips are biting, leave them. The pressure congests the skin. A dull ache and a heat build, and that buildup is what the pull releases.
The release is the point of the toy. The top takes the free end of the cord and pulls along the row, smooth and fast, parallel to the line or slightly out from the body. The clips pop off one after another, very fast, like a machine gun. Sharp pain hits as separate points and then as one line. Blood rushes back into the marks, hot, with the endorphin rush this kind of burst is known for. Bottoms describe it as clamp and slap at the same time.
Time, the pull, and aftercare
Keep the clamp time short. Watch the color of the skin, watch for numbness, and listen to the bottom, including the safeword. Do not clip the large vessels of the neck, broken or damaged skin, or genitals that have not been talked through and practiced. Pull straight. Do not twist the cord sideways, and do not rip at an angle. If a jaw twists as it leaves, the teeth can cut the skin. Wooden pins with a harder bite bruise more under the skin. Test that bite on your own wrist, or on the inside of your arm, before the clips go on someone else.
Aftercare starts as soon as the line is off. Rub and press the marks with the palm, to take the sharp edge down and get the blood moving. Check for scraped or broken skin. Warmth, and whatever reassurance that bottom wants, belong in the same few minutes.
